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FDP Forum / Guitar Mods, Repairs, and Projects / EBO Bass 4-position "Tone Choke" value?
(This message was last edited by Peegoo at 09:06 AM, Jun 18th, 2018)
FDP Forum / Guitar Mods, Repairs, and Projects / EBO Bass 4-position "Tone Choke" value?
Pinetree
Moderator Emeritus
(with many stars)
NW PennsylvaniaJun 17th, 2018 05:30 PM Edit Profile
Rebuilding an EB-O bass for a customer that wants to revert to the early 70's 4-position rotary selector circuit.
As far as I've been able to research, the "tone choke" is a 1.5 Henry inductor, but I just can't imagine fitting one of these (linked below) in the control cavity.
A little help please.
Leftee
Contributing Member
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VAJun 17th, 2018 05:58 PM Edit Profile
At least it wasn’t a flux capacitor. Those are a beyotch to install.
Pinetree
Moderator Emeritus
(with many stars)
NW PennsylvaniaJun 17th, 2018 06:30 PM Edit Profile
Dude, hows about saving the hilarity for Moe's?
Leftee
Contributing Member
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VAJun 17th, 2018 06:42 PM Edit Profile
Grumpy today?
Pinetree
Moderator Emeritus
(with many stars)
NW PennsylvaniaJun 17th, 2018 06:46 PM Edit Profile
Sunburned.
Peegoo
Contributing Member
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Ooo that sandwich
is gonna get etJun 17th, 2018 07:53 PM Edit Profile
Pinetree, the smaller 1.5H inductor is not a common item these days. Dan Torres used to sell them for a buck; his circuit (and others that were popular) was originally cooked up by Craig Anderton.
The small inductor is about 5/8" square.
I think Rothstein Guitars still sells them, but as part of a kit. They're getting them from somewhere. I'll bet if you call 'em they'll sell you one. Shipping will probably cost more than the part itself.
Leftee
Contributing Member
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VAJun 18th, 2018 06:48 AM Edit Profile
This begs the question, was this sort of thing ever done in a guitar?
Peegoo
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Ooo that sandwich
is gonna get etJun 18th, 2018 06:54 AM Edit Profile
Sure.
- Passive midrange boost mod kits
- Reverend's bass contour control
- Hohner's Pro series mid control
...and many others
Peegoo
Contributing Member
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Ooo that sandwich
is gonna get etJun 18th, 2018 07:03 AM Edit Profile
Mouser DOES stock it, but not as an inductor. They list it as a passive audio transformer, part number 42TL021-RC.
You use only the outer two leads of the primary winding for the 1.5H spec; the other four leads you snip off.
Wrap the thing with tape or stick a piece of heat shrink over it to prevent the clipped leads from grounding against anything in the cavity.
Click
hushnel
Contributing Member
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North Florida
A Friend of Bill W.Jun 18th, 2018 08:00 AM Edit Profile
Wow, the man, I’’m guessing I may have an idea what the non-answered emails were about.
I searched around for about half an hour and came up with nothing.
Pinetree
Moderator Emeritus
(with many stars)
NW PennsylvaniaJun 18th, 2018 08:01 AM Edit Profile
Thank you.
wrnchbndr
Contributing Member
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New Jersey
I'm back with the otters againJun 18th, 2018 08:59 AM Edit Profile
Sounds a lot like a Varitone circuit
Peegoo
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Ooo that sandwich
is gonna get etJun 18th, 2018 09:41 AM Edit Profile
Very similar. The Gibson Varitone typically uses five caps, each with a 10M resistor in series, sometimes through a 1.5H inductor to ground, that switch in and out with the rotary knobber. I always thought this circuit was overly complicated.
Notice there's a 100K resistor across the switch too. I think the engineers stuck it there to prevent pops through the amp when rotating the Varitone knob between positions because the early rotary switches were the "break before make" contact type.
Because the inductor is not rolled in and out (with a pot) like with the mid contour control, its effect is fairly subtle. You could leave it out of the circuit and it would still work pretty well.
wrnchbndr
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New Jersey
I'm back with the otters againJun 18th, 2018 10:14 AM Edit Profile
I really liked the Varitone circuit in a number of guitars that I did. I put all of the caps on the rotary switch and it took up just a little more space than a regular pot. I used an audio transformer like you mentioned earlier. I put the varitone circuit in place of a tone cap off of a 250K pot (tone control). Wide tonal pallet but like any guitar with excessive switching options you spend more time fiddling with controls than playing the guitar.
I've seen the original wiring as posted by Pinetree in an EB1 and was immediately blown away by both the bass and its tonal pallet. Not a lot of people liked the EB1 but I sure did. The one I worked on had great mojo. But then I'm not really a bass player.
Peegoo
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Ooo that sandwich
is gonna get etJun 18th, 2018 04:15 PM Edit Profile
The engineers on the EB0 and EB1 knew their stuff.
They understood the importance of how magnetic reactance, coupled with a base plate of prefamulated amulite, improved panendermic transconductance through the semi-boloid slots in the stator.
Pinetree
Moderator Emeritus
(with many stars)
NW PennsylvaniaJun 19th, 2018 07:27 PM Edit Profile
I have a suspicion that the owner of this particular instrument is trying to restore it to its former glory, and perhaps try to sell it or pass it off as original.
Of course I just keep my mouth shut...
Peegoo
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Ooo that sandwich
is gonna get etJun 19th, 2018 08:48 PM Edit Profile
You're a trained monkey when you provide a service like this.
Unless you're aware of a crime being (or about to be) committed, ya ignores everything beyond the range of your soldering fumes and ya takes yer money :o)
Leftee
Contributing Member
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VAJun 20th, 2018 06:06 AM Edit Profile
mmmmmmmmmmmmmmmmm
soldering fumes
Peegoo
Contributing Member
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Ooo that sandwich
is gonna get etJun 20th, 2018 09:26 AM Edit Profile
I kinda like 'it. Smells like a campfire started with pine heartwood ("lighter knot," "fatwood," etc.).
If I smell and hear bacon frying though, it usually means I've mistakenly grabbed the hot pokey end of the soldering stick, and I do loud, ad lib rap flow.
Leftee
Contributing Member
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VAJun 20th, 2018 10:24 AM Edit Profile
It is rather piney.
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